How this YC-backed B2B SaaS drove 108 demos and new signups in 14 days

The first challenge was the list. When your ICP isn't on LinkedIn, you can't just pull a CSV from Apollo and start sending. School staff don't exist in most B2B databases, so we built the list from scratch using a combination of government NCES directories, school website crawling, and internal reply data from 25M+ emails we've sent over our history in this space. Here's exactly how the list was built: Most schools publish a staff page. We pulled those pages at scale and extracted the names and roles of every decision maker listed -- principals, librarians, IT directors -- along with the grade level each person was responsible for. This gave us verified, role-specific contacts rather than generic "teacher" records that would never convert. Next, we brute-forced the email addresses. With each person's full name and their school's domain, we generated hundreds of possible email format combinations and validated them to surface the combinations most likely to land in an inbox. Then we filtered out anyone who wasn't a K-12 decision maker. Because we scraped the source websites, we could verify each contact before loading them into a campaign. Final count: 30,000 verified contacts in a niche where the big-name databases had almost nothing. On the infrastructure side, we spun up pre-warmed sending capacity across 180+ domains specifically for this sprint. Deliverability at volume requires this level of setup -- you cannot just increase send limits on existing domains and expect results. Every domain was warmed, every inbox was configured, and everything was ready before the first email went out. We launched 5 messaging variants simultaneously on day one and ran rapid iteration on a 2-day cycle. Every 48 hours, we cut the variants that weren't pulling replies and scaled the budget and volume into the ones that were. This is not A/B testing in the traditional sense -- it's more like a controlled elimination process where only the highest-signal copy survives. A few days in, the meeting volume became a bottleneck. Their sales team was getting booked faster than they could take calls. The client's engineering team built a direct signup workflow overnight -- a link prospects could use to create an account on the spot instead of waiting for a demo. We pivoted part of the outreach to push that flow immediately. 42 of the 108 opportunities came in through that link in just 3-4 days. There were mornings where I booked calls at 5am on Slack and their team was taking those calls at 8:30am.